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Prestressed bellows

 
     
 

   Prestressed bellows
Prestressed plastic corrugated pipe raw materials is HDPE. Its corrosion resistance is far superior to the metal, not afraid of acid, alkali corrosion, it itself does not corrosion, can effectively protect tendons from corrosion. A lot of prestressed structure under external serious consequences, such as deicing salt or salt water. As a component of the waterproof layer after due to collapse, micro cracks is leaking and drainage facilities obstruction or failure, tendons will may be corrosion function.
The FIP construction guidelines (1990), "the" tendons of grouting "points out, no permanent metal corrosion resistance, resistance to water leakage and reach paste and tendons. And prestressed plastic corrugated pipe can provide a kind of prestressed steel corrugated metal pipe is far superior to the barrier protection effect, can prevent the pollution of harmful substances through pipelines, so as to ensure post-tensioned pre-stressing concrete structure has better durability; Prestressed plastic corrugated pipe is HDPE as raw material, is a modern materials into hole.
Important application in a prestressed concrete structure after, tie rods into hole, with good sealing, no water leakage OARS, ring high stiffness, the friction parameters small, ageing resistance, resistance to electrical erosion, soft elastic good, not easy to be beaten cut broken and the great new way.this way more convenient construction connection of strengths. As porous materials after by corruption, paddle body is the prestressed concrete structure of prestressed steel plate last a protective barrier.

Bridge prestressed bellows, bellows and cable bridge plastic corrugated pipe, cast-in-situ prestressed plastic corrugated pipe
Prestressed plastic corrugated pipe
This method is mainly used in prestressed concrete structure, the components into a hole. This company produces the plastic ZY high density polyethylene (HDPE) or polypropylene (PP) as raw materials with advanced production technology production, has the good sealing no ooze water leakage slurry, ring high stiffness, small friction coefficient, ageing resistance, resistance to corrosion, flexibility is good, not easy be pounding cut and new model of the great connections to connect the advantages of construction more convenient, solve the traditional metal bellows all the disadvantages.
Prestressed plastic corrugated pipe generic names: bridge prestressed corrugated pipe, prestressed concrete pipe, plastic spiral with corrugated pipe, cast-in-situ prestressed plastic corrugated pipe, bridge plastic corrugated pipe, steel bellows
The corrugated pipe as a method of prestressed after into porous materials prestressed system is the important component of the long prestressed engineering corrugated metal tube as into hole material, in order to overcome metal bellows seal, damaged, easy to poor rust, friction big shortcoming, and at the same time, in order to provide a extra prestressed reinforcement corrosion protective screen, recommends the polyethylene polypropylene plastic production or corrugated pipe binder as revolutionary product after a law to provide structure of the life.
Technical requirements
Comply with the traffic industry standard JT/T529-2004
Plastic corrugated pipe materials should be used in the original granular materials. It is strictly prohibited to use powder and recycling makings shape raw materials. High density polyethylene (HDPE) shall meet the requirements of GB/T11116, polypropylene (PP) shall meet the requirements of GB/T18742.1.
The appearance of the plastic corrugated pipe should be smooth, the color and luster is even, internal and external wall is not allowed to have every body rupture, bubble, split, lumps and influence the use of scratch.
Plastic corrugated penstock stiffness not less than 6 kN/m2
Plastic corrugated pipe under horizontal local loads, pipes surface should not be broken; Unloading after 5 min residual deformation pipe shall not exceed 10% of the pipe diameter.
Plastic corrugated pipe bending method by the regulation again and again after bending five times, and a dedicated to plug from plastic wave tube smoothly through, the plastic corrugated flexible qualified.
Plastic corrugated pipe low temperature concussion test vacuum impact TIR allowable value for maximum rate 10%.
Plastic corrugated pipe connection
Plastic corrugated pipe on the long can use plastic welding machine for welding or by mechanical connection. The mechanical connection in the form of joint, including pipe and tube connects the connection of the pipe, tube and the anchorage pad of head, tube connection connected with exhaust pipe connection exhaust pipe connection head three categories.
Prestressed plastic corrugated pipe flexibility good, ring high stiffness, does not fear the pressing, not easy be cut thee great broken
Prestressed plastic corrugated pipe is by high density polyethylene (HDPE) the plastic extruder extrusion of single wall corrugated pipe, used for a prestressed concrete structure, prestressed reinforcement, as the pore forming pipeline. I company of production of prestressed plastic corrugated pipe appearance of the product quality, structure size, ring stiffness, local horizontal load, flexibility and technical indexes, accord with the ministry of communications industry standard the prestressed concrete bridge with plastic corrugated pipe "JT/T529-2004 technical requirements and GB/T9647-2003 national standards. Prestressed plastic corrugated pipe is a new type of material into a hole, and pre-stress compared corrugated metal pipe, it has the following advantages:

1.The prestressed plastic corrugated pipe high-density polyethylene (HDPE) as raw materials with advanced production technology production and into. Its corrosion resistance is far superior to the metal, not afraid of acid, alkali corrosion, it itself does not corrosion, can effectively protect the tendons from corrosion. A lot of prestressed structure under the influence of the external serious, deicing salt or salt water. Prestressed plastic corrugated pipe prestressed reinforcement can provide a corrugated metal pipe is far superior to the barrier protection effect, can prevent the pollution of harmful substances through pipelines, so as to ensure post-tensioned pre-stressing concrete structure has better durability.

2.under the same condition prestressed plastic corrugated pipe friction coefficients reserve duct obviously less than metal bellows obligate duct friction coefficient, which can reduce the tension in the process of the prestressed friction losses. The general prestressed plastic corrugated pipe friction coefficients take 0.14, and metal corrugated pipe friction coefficients take 0.25; Prestressed plastic corrugated pipe of the high strength, not afraid pressing, not easy be vibrating great break gouge, its seal performance and higher than the anti-permeability of corrugated metal pipe, more used in vacuum grouting;
3. Prestressed plastic corrugated pipe flexibility good, ring high stiffness, does not fear the pressing, not easy be cut thee great broken
4. Prestressed plastic corrugated pipe insulation, can prevent the stray current corrosion, and metal are good conductors of electricity;
5. Prestressed plastic corrugated pipe has better work performance, can greatly improve the component anti-fatigue capability.

 
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